Method of drying varnished (patent) leather



- UNITED STATES PATENT OFFICE.

HEINRICH SCHULZ, OF WORMS, GERMANY, ASSIGNOR T0 IIRM CORNELIUS HEYL, OFWORMS, GERMANY.

METHOD OF DRYING VARNISHED (PATENT) LEATHER.

No Drawing.

To all whom it may comeml:

Be it known that I, HEINRICH SOHULZ, chemist, subject of the German Emeror, residing at No. o7, Alzeyerstrasse, orms,

5 Germany, have Invented certain new and useful Improvements in, Methodsof Drying Varnished (Patent) Leather, of which the following is aspecification.

In the specification of German Patent 284605 a method of dryingvarnished (patent) leather has been disclosed according to which theleather dried in an oven is exposed for further drying to thesimultaneous action of preferably ultraviolet light and ammonia vapors.I'n carrying out this method in practice it has been observed that, onthe one hand, no ozone odor is produced, and, on the other hand, alsothe characteristic odor of the ammonia almost completely disappears.This led to further orservations the result of which was the recognizingof the fact that, when quartz light and amm0nia.are employed together,the latter undergoes certain chemical chan es, by which derivatives ofammonia nydrazin) and finally which substances extremely 'favorabnitrogen are produced, ield, as has been found, e drying results.

Specification of Letters Patent.

-varnished leather, jecting the leather to the simultaneous ac- PatentedSept. 28, 1920.

. Application filed December 12, 1916. Serial No..136,410.

The present invention accordingly resides in employing, in place ofammonia, derivatives of ammonia or pure'nitro en (which is thefinalproduct of chemical ricomposition of ammonia), whereby a much morerapiddrying can be effected than is possible with ammonia. It has alsobeen discovered, moreover, that other inactive gases may be substitutedfor the pure nitrogen.

I claim:

1. The herein-described method of drying varnished leather, whichconsists in .subjecting the leather to the simultaneous action ofultraviolet rays and hydrazin.

2. The herein-described method of drying varnished leather, whichconsists in sub jecting the leather to the simultaneous action of lightrays and hydrazin.

3. The herein-described method of drying which consists in subtion ofultraviolet rays and a gaseous derivative of ammonia.

In testimony whereof I afiix my signature.

HEINRICH SCHULZ.

